header{
    min-width: 549px;
    padding: 20px;
    box-shadow: 0 3px 3px rgb(242, 148, 6);
}
ul{
    padding: 0;
    margin: 0;
}
header::after{ /*定义一个伪类*/
    content: '';
    display: block;
    clear: both;
}
header div{
    float: left;
}
header div.radius{
    float: right;
    text-align: center;
    line-height: 47px;
}
header div.title{
    height: 47px;
    line-height: 47px;
    width: 70%;
    color: rgb(242, 148, 6);
    text-align: center;
    font-size: 20px;
}
div.icon{
    width: 47px;
    height: 47px;
    background-image: url('./imgs/i_head4.png');
    background-position: -20px -30px;
}
div.radius{
    background-color: dodgerblue;
    border-radius: 23px 0 0 23px;
    transition:all 0.5s;
    width:100px;
    height:47px;
}
section.main input{
    width: 90%;
    margin: 20px;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ccc;
}
section.main ul.nav li{
    display: inline-block;
    text-align: center;
    width: 32%;
    height: 48px;
    line-height: 48px;
}
section.main ul li a{
    color: #333;
    text-decoration: none;
    font-size: 18px;
}
section.main ul li.active{
    border-bottom: 3px solid rgb(242, 148, 6);
}
ul.nav{
    border-bottom: 2px solid #ccc;
}
section.mid-con div.title{
    margin-top: 38px;
    margin-bottom: 20px;
    border-top: 2px solid rgb(242, 148, 6);
}

section.mid-con div.pics ul li{
    width: 31.3%;
    float: left;
    margin: 10px;
    position: relative;
}
section.mid-con div.pics ul li img{
    width: 100%;
}
section.mid-con div.pics ul li span{
    position: absolute;
    bottom: 0px;
    left: 0px;
    display: block;
    width: 100%;
    height: 47px;
    line-height: 47px;
    font-size: 18px;
}
